condition mean min max ZT0-3 0.084420875 0.0682092 0.10063255 ZT4-7 0.03397995 0.03397995 0.03397995 ZT8-11 0.022805649999999997 0.022805649999999997 0.022805649999999997 ZT12-15 0 0 0 ZT16-19 0.055836 0.055836 0.055836 ZT20-23 0.0561366 0.0561366 0.0561366